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Tao Bao6d99d4b2018-04-25 16:47:04 -07001/*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
Tao Bao42c45e22018-07-31 09:37:12 -070017#include <dlfcn.h>
Jerry Zhangf5e319a2018-05-04 11:24:10 -070018#include <errno.h>
19#include <fcntl.h>
20#include <getopt.h>
21#include <inttypes.h>
22#include <limits.h>
23#include <linux/fs.h>
24#include <stdarg.h>
Tao Bao6d99d4b2018-04-25 16:47:04 -070025#include <stdio.h>
26#include <stdlib.h>
Jerry Zhangf5e319a2018-05-04 11:24:10 -070027#include <string.h>
28#include <sys/stat.h>
29#include <sys/types.h>
30#include <time.h>
Tao Bao6d99d4b2018-04-25 16:47:04 -070031#include <unistd.h>
32
Hridya Valsaraju20c81b32018-07-27 22:09:12 -070033#include <atomic>
Jerry Zhangf5e319a2018-05-04 11:24:10 -070034#include <string>
Hridya Valsaraju20c81b32018-07-27 22:09:12 -070035#include <thread>
Jerry Zhangf5e319a2018-05-04 11:24:10 -070036#include <vector>
Tao Bao6d99d4b2018-04-25 16:47:04 -070037
Jerry Zhangf5e319a2018-05-04 11:24:10 -070038#include <android-base/file.h>
Tao Bao6d99d4b2018-04-25 16:47:04 -070039#include <android-base/logging.h>
Jerry Zhangf5e319a2018-05-04 11:24:10 -070040#include <android-base/properties.h>
41#include <android-base/strings.h>
Hridya Valsaraju20c81b32018-07-27 22:09:12 -070042#include <android-base/unique_fd.h>
Jerry Zhangf5e319a2018-05-04 11:24:10 -070043#include <bootloader_message/bootloader_message.h>
44#include <cutils/android_reboot.h>
Hridya Valsaraju20c81b32018-07-27 22:09:12 -070045#include <cutils/sockets.h>
Tao Bao6d99d4b2018-04-25 16:47:04 -070046#include <private/android_logger.h> /* private pmsg functions */
Jerry Zhangf5e319a2018-05-04 11:24:10 -070047#include <selinux/android.h>
48#include <selinux/label.h>
49#include <selinux/selinux.h>
Tao Bao6d99d4b2018-04-25 16:47:04 -070050
51#include "common.h"
Hridya Valsaraju20c81b32018-07-27 22:09:12 -070052#include "fastboot/fastboot.h"
Jerry Zhang152933a2018-05-02 16:56:00 -070053#include "logging.h"
Tao Bao6d99d4b2018-04-25 16:47:04 -070054#include "minadbd/minadbd.h"
55#include "otautil/paths.h"
Jerry Zhangf5e319a2018-05-04 11:24:10 -070056#include "otautil/sysutil.h"
57#include "recovery.h"
Tianjie Xub5108c32018-08-20 13:40:47 -070058#include "recovery_ui/device.h"
59#include "recovery_ui/stub_ui.h"
60#include "recovery_ui/ui.h"
Jerry Zhangf5e319a2018-05-04 11:24:10 -070061#include "roots.h"
Tao Bao6d99d4b2018-04-25 16:47:04 -070062
Jerry Zhangf5e319a2018-05-04 11:24:10 -070063static constexpr const char* COMMAND_FILE = "/cache/recovery/command";
64static constexpr const char* LOCALE_FILE = "/cache/recovery/last_locale";
65
66static constexpr const char* CACHE_ROOT = "/cache";
67
68bool has_cache = false;
69
70RecoveryUI* ui = nullptr;
71struct selabel_handle* sehandle;
72
Tao Bao6d99d4b2018-04-25 16:47:04 -070073static void UiLogger(android::base::LogId /* id */, android::base::LogSeverity severity,
74 const char* /* tag */, const char* /* file */, unsigned int /* line */,
75 const char* message) {
76 static constexpr char log_characters[] = "VDIWEF";
77 if (severity >= android::base::ERROR && ui != nullptr) {
78 ui->Print("E:%s\n", message);
79 } else {
80 fprintf(stdout, "%c:%s\n", log_characters[severity], message);
81 }
82}
83
Jerry Zhangf5e319a2018-05-04 11:24:10 -070084// command line args come from, in decreasing precedence:
85// - the actual command line
86// - the bootloader control block (one per line, after "recovery")
87// - the contents of COMMAND_FILE (one per line)
88static std::vector<std::string> get_args(const int argc, char** const argv) {
89 CHECK_GT(argc, 0);
90
91 bootloader_message boot = {};
92 std::string err;
93 if (!read_bootloader_message(&boot, &err)) {
94 LOG(ERROR) << err;
95 // If fails, leave a zeroed bootloader_message.
96 boot = {};
97 }
98 stage = std::string(boot.stage);
99
David Andersoneee4e262018-08-21 13:10:45 -0700100 std::string boot_command;
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700101 if (boot.command[0] != 0) {
David Andersoneee4e262018-08-21 13:10:45 -0700102 if (memchr(boot.command, '\0', sizeof(boot.command))) {
103 boot_command = std::string(boot.command);
104 } else {
105 boot_command = std::string(boot.command, sizeof(boot.command));
106 }
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700107 LOG(INFO) << "Boot command: " << boot_command;
108 }
109
110 if (boot.status[0] != 0) {
111 std::string boot_status = std::string(boot.status, sizeof(boot.status));
112 LOG(INFO) << "Boot status: " << boot_status;
113 }
114
115 std::vector<std::string> args(argv, argv + argc);
116
117 // --- if arguments weren't supplied, look in the bootloader control block
118 if (args.size() == 1) {
119 boot.recovery[sizeof(boot.recovery) - 1] = '\0'; // Ensure termination
120 std::string boot_recovery(boot.recovery);
121 std::vector<std::string> tokens = android::base::Split(boot_recovery, "\n");
122 if (!tokens.empty() && tokens[0] == "recovery") {
123 for (auto it = tokens.begin() + 1; it != tokens.end(); it++) {
124 // Skip empty and '\0'-filled tokens.
125 if (!it->empty() && (*it)[0] != '\0') args.push_back(std::move(*it));
126 }
127 LOG(INFO) << "Got " << args.size() << " arguments from boot message";
128 } else if (boot.recovery[0] != 0) {
129 LOG(ERROR) << "Bad boot message: \"" << boot_recovery << "\"";
130 }
131 }
132
133 // --- if that doesn't work, try the command file (if we have /cache).
134 if (args.size() == 1 && has_cache) {
135 std::string content;
136 if (ensure_path_mounted(COMMAND_FILE) == 0 &&
137 android::base::ReadFileToString(COMMAND_FILE, &content)) {
138 std::vector<std::string> tokens = android::base::Split(content, "\n");
139 // All the arguments in COMMAND_FILE are needed (unlike the BCB message,
140 // COMMAND_FILE doesn't use filename as the first argument).
141 for (auto it = tokens.begin(); it != tokens.end(); it++) {
142 // Skip empty and '\0'-filled tokens.
143 if (!it->empty() && (*it)[0] != '\0') args.push_back(std::move(*it));
144 }
145 LOG(INFO) << "Got " << args.size() << " arguments from " << COMMAND_FILE;
146 }
147 }
148
149 // Write the arguments (excluding the filename in args[0]) back into the
150 // bootloader control block. So the device will always boot into recovery to
151 // finish the pending work, until finish_recovery() is called.
152 std::vector<std::string> options(args.cbegin() + 1, args.cend());
153 if (!update_bootloader_message(options, &err)) {
154 LOG(ERROR) << "Failed to set BCB message: " << err;
155 }
156
David Andersoneee4e262018-08-21 13:10:45 -0700157 // Finally, if no arguments were specified, check whether we should boot
158 // into fastboot.
159 if (args.size() == 1 && boot_command == "boot-fastboot") {
160 args.emplace_back("--fastboot");
161 }
162
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700163 return args;
164}
165
166static std::string load_locale_from_cache() {
167 if (ensure_path_mounted(LOCALE_FILE) != 0) {
168 LOG(ERROR) << "Can't mount " << LOCALE_FILE;
169 return "";
170 }
171
172 std::string content;
173 if (!android::base::ReadFileToString(LOCALE_FILE, &content)) {
174 PLOG(ERROR) << "Can't read " << LOCALE_FILE;
175 return "";
176 }
177
178 return android::base::Trim(content);
179}
180
Hridya Valsaraju20c81b32018-07-27 22:09:12 -0700181static void ListenRecoverySocket(RecoveryUI* ui, std::atomic<Device::BuiltinAction>& action) {
182 android::base::unique_fd sock_fd(android_get_control_socket("recovery"));
183 if (sock_fd < 0) {
184 PLOG(ERROR) << "Failed to open recovery socket";
185 return;
186 }
187 listen(sock_fd, 4);
188
189 while (true) {
190 android::base::unique_fd connection_fd;
191 connection_fd.reset(accept(sock_fd, nullptr, nullptr));
192 if (connection_fd < 0) {
193 PLOG(ERROR) << "Failed to accept socket connection";
194 continue;
195 }
196 char msg;
197 constexpr char kSwitchToFastboot = 'f';
198 constexpr char kSwitchToRecovery = 'r';
199 ssize_t ret = TEMP_FAILURE_RETRY(read(connection_fd, &msg, sizeof(msg)));
200 if (ret != sizeof(msg)) {
201 PLOG(ERROR) << "Couldn't read from socket";
202 continue;
203 }
204 switch (msg) {
205 case kSwitchToRecovery:
206 action = Device::BuiltinAction::ENTER_RECOVERY;
207 break;
208 case kSwitchToFastboot:
209 action = Device::BuiltinAction::ENTER_FASTBOOT;
210 break;
211 default:
212 LOG(ERROR) << "Unrecognized char from socket " << msg;
213 continue;
214 }
215 ui->InterruptKey();
216 }
217}
218
Tao Bao6d99d4b2018-04-25 16:47:04 -0700219static void redirect_stdio(const char* filename) {
Tao Bao6fcd2082019-01-16 09:29:17 -0800220 android::base::unique_fd pipe_read, pipe_write;
221 // Create a pipe that allows parent process sending logs over.
222 if (!android::base::Pipe(&pipe_read, &pipe_write)) {
223 PLOG(ERROR) << "Failed to create pipe for redirecting stdio";
Tao Bao6d99d4b2018-04-25 16:47:04 -0700224
225 // Fall back to traditional logging mode without timestamps. If these fail, there's not really
226 // anywhere to complain...
227 freopen(filename, "a", stdout);
228 setbuf(stdout, nullptr);
229 freopen(filename, "a", stderr);
230 setbuf(stderr, nullptr);
231
232 return;
233 }
234
235 pid_t pid = fork();
236 if (pid == -1) {
Tao Bao6fcd2082019-01-16 09:29:17 -0800237 PLOG(ERROR) << "Failed to fork for redirecting stdio";
Tao Bao6d99d4b2018-04-25 16:47:04 -0700238
239 // Fall back to traditional logging mode without timestamps. If these fail, there's not really
240 // anywhere to complain...
241 freopen(filename, "a", stdout);
242 setbuf(stdout, nullptr);
243 freopen(filename, "a", stderr);
244 setbuf(stderr, nullptr);
245
246 return;
247 }
248
249 if (pid == 0) {
Tao Bao6fcd2082019-01-16 09:29:17 -0800250 // Child process reads the incoming logs and doesn't write to the pipe.
251 pipe_write.reset();
Tao Bao6d99d4b2018-04-25 16:47:04 -0700252
253 auto start = std::chrono::steady_clock::now();
254
255 // Child logger to actually write to the log file.
256 FILE* log_fp = fopen(filename, "ae");
257 if (log_fp == nullptr) {
258 PLOG(ERROR) << "fopen \"" << filename << "\" failed";
Tao Bao6d99d4b2018-04-25 16:47:04 -0700259 _exit(EXIT_FAILURE);
260 }
261
Tao Bao6fcd2082019-01-16 09:29:17 -0800262 FILE* pipe_fp = android::base::Fdopen(std::move(pipe_read), "r");
Tao Bao6d99d4b2018-04-25 16:47:04 -0700263 if (pipe_fp == nullptr) {
264 PLOG(ERROR) << "fdopen failed";
265 check_and_fclose(log_fp, filename);
Tao Bao6d99d4b2018-04-25 16:47:04 -0700266 _exit(EXIT_FAILURE);
267 }
268
269 char* line = nullptr;
270 size_t len = 0;
271 while (getline(&line, &len, pipe_fp) != -1) {
272 auto now = std::chrono::steady_clock::now();
273 double duration =
274 std::chrono::duration_cast<std::chrono::duration<double>>(now - start).count();
275 if (line[0] == '\n') {
276 fprintf(log_fp, "[%12.6lf]\n", duration);
277 } else {
278 fprintf(log_fp, "[%12.6lf] %s", duration, line);
279 }
280 fflush(log_fp);
281 }
282
283 PLOG(ERROR) << "getline failed";
284
Tao Bao6fcd2082019-01-16 09:29:17 -0800285 fclose(pipe_fp);
Tao Bao6d99d4b2018-04-25 16:47:04 -0700286 free(line);
287 check_and_fclose(log_fp, filename);
Tao Bao6d99d4b2018-04-25 16:47:04 -0700288 _exit(EXIT_FAILURE);
289 } else {
290 // Redirect stdout/stderr to the logger process. Close the unused read end.
Tao Bao6fcd2082019-01-16 09:29:17 -0800291 pipe_read.reset();
Tao Bao6d99d4b2018-04-25 16:47:04 -0700292
293 setbuf(stdout, nullptr);
294 setbuf(stderr, nullptr);
295
Tao Bao6fcd2082019-01-16 09:29:17 -0800296 if (dup2(pipe_write.get(), STDOUT_FILENO) == -1) {
Tao Bao6d99d4b2018-04-25 16:47:04 -0700297 PLOG(ERROR) << "dup2 stdout failed";
298 }
Tao Bao6fcd2082019-01-16 09:29:17 -0800299 if (dup2(pipe_write.get(), STDERR_FILENO) == -1) {
Tao Bao6d99d4b2018-04-25 16:47:04 -0700300 PLOG(ERROR) << "dup2 stderr failed";
301 }
Tao Bao6d99d4b2018-04-25 16:47:04 -0700302 }
303}
304
305int main(int argc, char** argv) {
306 // We don't have logcat yet under recovery; so we'll print error on screen and log to stdout
307 // (which is redirected to recovery.log) as we used to do.
308 android::base::InitLogging(argv, &UiLogger);
309
310 // Take last pmsg contents and rewrite it to the current pmsg session.
311 static constexpr const char filter[] = "recovery/";
312 // Do we need to rotate?
313 bool do_rotate = false;
314
315 __android_log_pmsg_file_read(LOG_ID_SYSTEM, ANDROID_LOG_INFO, filter, logbasename, &do_rotate);
316 // Take action to refresh pmsg contents
317 __android_log_pmsg_file_read(LOG_ID_SYSTEM, ANDROID_LOG_INFO, filter, logrotate, &do_rotate);
318
319 // If this binary is started with the single argument "--adbd", instead of being the normal
320 // recovery binary, it turns into kind of a stripped-down version of adbd that only supports the
321 // 'sideload' command. Note this must be a real argument, not anything in the command file or
322 // bootloader control block; the only way recovery should be run with this argument is when it
323 // starts a copy of itself from the apply_from_adb() function.
324 if (argc == 2 && strcmp(argv[1], "--adbd") == 0) {
325 minadbd_main();
326 return 0;
327 }
328
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700329 time_t start = time(nullptr);
330
Tao Bao6d99d4b2018-04-25 16:47:04 -0700331 // redirect_stdio should be called only in non-sideload mode. Otherwise we may have two logger
332 // instances with different timestamps.
333 redirect_stdio(Paths::Get().temporary_log_file().c_str());
334
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700335 load_volume_table();
336 has_cache = volume_for_mount_point(CACHE_ROOT) != nullptr;
337
338 std::vector<std::string> args = get_args(argc, argv);
Tao Bao1700cc42018-07-16 22:09:59 -0700339 auto args_to_parse = StringVectorToNullTerminatedArray(args);
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700340
341 static constexpr struct option OPTIONS[] = {
Hridya Valsaraju20c81b32018-07-27 22:09:12 -0700342 { "fastboot", no_argument, nullptr, 0 },
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700343 { "locale", required_argument, nullptr, 0 },
344 { "show_text", no_argument, nullptr, 't' },
345 { nullptr, 0, nullptr, 0 },
346 };
347
348 bool show_text = false;
Hridya Valsaraju20c81b32018-07-27 22:09:12 -0700349 bool fastboot = false;
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700350 std::string locale;
351
352 int arg;
353 int option_index;
Tao Bao1700cc42018-07-16 22:09:59 -0700354 while ((arg = getopt_long(args_to_parse.size() - 1, args_to_parse.data(), "", OPTIONS,
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700355 &option_index)) != -1) {
356 switch (arg) {
357 case 't':
358 show_text = true;
359 break;
360 case 0: {
361 std::string option = OPTIONS[option_index].name;
362 if (option == "locale") {
363 locale = optarg;
Hridya Valsaraju7f41a2c2018-09-19 16:29:01 -0700364 } else if (option == "fastboot" &&
Yifan Hongd17174c2018-11-16 12:49:33 -0800365 android::base::GetBoolProperty("ro.boot.dynamic_partitions", false)) {
Hridya Valsaraju20c81b32018-07-27 22:09:12 -0700366 fastboot = true;
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700367 }
368 break;
369 }
370 }
371 }
Jerry Zhang49fd5d22018-05-17 12:54:41 -0700372 optind = 1;
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700373
374 if (locale.empty()) {
375 if (has_cache) {
376 locale = load_locale_from_cache();
377 }
378
379 if (locale.empty()) {
380 static constexpr const char* DEFAULT_LOCALE = "en-US";
381 locale = DEFAULT_LOCALE;
382 }
383 }
384
Tao Bao42c45e22018-07-31 09:37:12 -0700385 static constexpr const char* kDefaultLibRecoveryUIExt = "librecovery_ui_ext.so";
386 // Intentionally not calling dlclose(3) to avoid potential gotchas (e.g. `make_device` may have
387 // handed out pointers to code or static [or thread-local] data and doesn't collect them all back
388 // in on dlclose).
389 void* librecovery_ui_ext = dlopen(kDefaultLibRecoveryUIExt, RTLD_NOW);
390
391 using MakeDeviceType = decltype(&make_device);
392 MakeDeviceType make_device_func = nullptr;
393 if (librecovery_ui_ext == nullptr) {
394 printf("Failed to dlopen %s: %s\n", kDefaultLibRecoveryUIExt, dlerror());
395 } else {
396 reinterpret_cast<void*&>(make_device_func) = dlsym(librecovery_ui_ext, "make_device");
397 if (make_device_func == nullptr) {
398 printf("Failed to dlsym make_device: %s\n", dlerror());
399 }
400 }
401
402 Device* device;
403 if (make_device_func == nullptr) {
404 printf("Falling back to the default make_device() instead\n");
405 device = make_device();
406 } else {
407 printf("Loading make_device from %s\n", kDefaultLibRecoveryUIExt);
408 device = (*make_device_func)();
409 }
410
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700411 if (android::base::GetBoolProperty("ro.boot.quiescent", false)) {
412 printf("Quiescent recovery mode.\n");
413 device->ResetUI(new StubRecoveryUI());
414 } else {
415 if (!device->GetUI()->Init(locale)) {
416 printf("Failed to initialize UI; using stub UI instead.\n");
417 device->ResetUI(new StubRecoveryUI());
418 }
419 }
420 ui = device->GetUI();
421
422 if (!has_cache) {
423 device->RemoveMenuItemForAction(Device::WIPE_CACHE);
424 }
425
Yifan Hongd17174c2018-11-16 12:49:33 -0800426 if (!android::base::GetBoolProperty("ro.boot.dynamic_partitions", false)) {
Hridya Valsarajudaa301e2018-09-18 14:48:01 -0700427 device->RemoveMenuItemForAction(Device::ENTER_FASTBOOT);
428 }
429
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700430 ui->SetBackground(RecoveryUI::NONE);
431 if (show_text) ui->ShowText(true);
432
Hridya Valsaraju20c81b32018-07-27 22:09:12 -0700433 LOG(INFO) << "Starting recovery (pid " << getpid() << ") on " << ctime(&start);
434 LOG(INFO) << "locale is [" << locale << "]";
435
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700436 sehandle = selinux_android_file_context_handle();
437 selinux_android_set_sehandle(sehandle);
438 if (!sehandle) {
439 ui->Print("Warning: No file_contexts\n");
440 }
441
Hridya Valsaraju20c81b32018-07-27 22:09:12 -0700442 std::atomic<Device::BuiltinAction> action;
443 std::thread listener_thread(ListenRecoverySocket, ui, std::ref(action));
444 listener_thread.detach();
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700445
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700446 while (true) {
Hridya Valsaraju20c81b32018-07-27 22:09:12 -0700447 std::string usb_config = fastboot ? "fastboot" : is_ro_debuggable() ? "adb" : "none";
448 std::string usb_state = android::base::GetProperty("sys.usb.state", "none");
449 if (usb_config != usb_state) {
450 if (!SetUsbConfig("none")) {
451 LOG(ERROR) << "Failed to clear USB config";
452 }
453 if (!SetUsbConfig(usb_config)) {
454 LOG(ERROR) << "Failed to set USB config to " << usb_config;
455 }
456 }
457
David Anderson983e2d52019-01-02 11:35:38 -0800458 ui->SetEnableFastbootdLogo(fastboot);
459
Hridya Valsaraju20c81b32018-07-27 22:09:12 -0700460 auto ret = fastboot ? StartFastboot(device, args) : start_recovery(device, args);
461
462 if (ret == Device::KEY_INTERRUPTED) {
463 ret = action.exchange(ret);
464 if (ret == Device::NO_ACTION) {
465 continue;
466 }
467 }
468 switch (ret) {
469 case Device::SHUTDOWN:
470 ui->Print("Shutting down...\n");
471 android::base::SetProperty(ANDROID_RB_PROPERTY, "shutdown,");
472 break;
473
474 case Device::REBOOT_BOOTLOADER:
475 ui->Print("Rebooting to bootloader...\n");
476 android::base::SetProperty(ANDROID_RB_PROPERTY, "reboot,bootloader");
477 break;
478
479 case Device::ENTER_FASTBOOT:
David Anderson2b2f4232018-10-29 18:48:56 -0700480 if (logical_partitions_mapped()) {
481 ui->Print("Partitions may be mounted - rebooting to enter fastboot.");
482 android::base::SetProperty(ANDROID_RB_PROPERTY, "reboot,fastboot");
483 } else {
484 LOG(INFO) << "Entering fastboot";
485 fastboot = true;
486 }
Hridya Valsaraju20c81b32018-07-27 22:09:12 -0700487 break;
488
489 case Device::ENTER_RECOVERY:
490 LOG(INFO) << "Entering recovery";
491 fastboot = false;
492 break;
493
494 default:
495 ui->Print("Rebooting...\n");
496 reboot("reboot,");
497 break;
498 }
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700499 }
Hridya Valsaraju20c81b32018-07-27 22:09:12 -0700500
Jerry Zhangf5e319a2018-05-04 11:24:10 -0700501 // Should be unreachable.
502 return EXIT_SUCCESS;
Tao Bao6d99d4b2018-04-25 16:47:04 -0700503}